Hebrews 7:17

Yahweh has sworn and will not change His mind, “You are a priest forever According to the order of Melchizedek.”

just as He says also in another passage, “You are a priest forever According to the order of Melchizedek.”

Now if perfection was through the Levitical priesthood (for on the basis of it the people received the Law), what further need was there for another priest to arise according to the order of Melchizedek, and not be designated according to the order of Aaron?

(for they indeed became priests without an oath, but He with an oath through the One who said to Him, “The Lord has sworn And will not change His mind, ‘You are a priest forever’”);